Annunciator for telephone-signals



(No Model.) 7

' J. B. ODELL.

ANNUNCIATOR FOR TELEPHONE SIGNALS! No. 250,384. Patented Dec. 6,1881.

UNITED STATES PATENT OFFICE.

JOHN B. ODELL, OF CHICAGO, ILLINOIS.-

ANNUNCIATOR FOR TELEPHONE-SIGNALS.

SPECIFICATION forming part of Letters Patent No; 250,384, dated December 6, 1881.

Application filed August 4, 1881. (No model.)

To all whom it may concern:

Be it known than I, JOHN B. ODELL, of Qhicago, 000k county, State of Illinois, have invented certain new and useful Improvements in Annunciators for Telephone Signals, of which the following is a specification.

My invention relates to improvements in ann uneiator-drops for telephone-signals; and the same consists in providing the hinged drop with an arm, which operates when the drop falls to at once automatically close the ringereircuit and shunt or short-circuit the coils of the annunciator, so that the bell may ring until the operator comes to the instrument, when by turning the handle of the contact-strip he can break the ringer-circuit and stop the ringing of the bell, said contact-strip being pushed back into position again by raising the drop.

My invention will be more fully understood by reference to the accompanying drawings, which form a part of this specification, and in which similar letters of reference indicate like parts.

In said drawings, Figure l is a side elevation of a device embodying my invention; and Fig.

' 2 is a plan view of the same, the magnet and armature of the annuneiator being removed.

In the drawings, A represents the frame piece or plate, to which the hinged drop B is pivoted.

O O are the coils of the electro-magnet, and

'D the armature, pivoted to the frame at d.

a is the adjustable screw-stop for the armature, and b is the catch-bar, provided with notches b for the drop. The catch-bar is pivoted to the slotted post I) on the armature, and may be adjusted in respect to the drop by the adjusting-screw b in the slotted post b on the end of the armature, said screw pressing the catch-bar against a spring, 11 which is secured to the post D The catch-bar is provided with a notch, b, at each end, so that by reversing its ends the same will operate to release the drop when the armature is operated by a closed circuit as well as by an open cireuit.

c c are binding-posts, to which the main or line wires 0 c are connected, and also the wires 0 0 leading to the coils O O.

c is a contact-strip secured to the bindingpost 0, the end of which projects under the end of the corresponding contact-strip 0 secured to the binding-post 0.

c c are similar contact-strips secured to the binding posts 0 c to which the wires of the ringer-circuit 0 0 are connected.

a is an arm projecting from the drop B, which operates when the drop falls to press the ends of the contact-strips c 0 together, and also the ends of the contact-strips c and 0 thus at the same time shunting or short-circuiting the coils O U and closing the ringercircuit. The contact-strip 0 turns on the bindin g-post c as a pivot, and is provided with a handle or crank-arm, 0 by which the operator, when he comes to the instrument, may swing said contact-strip from underneath the strip a and break the rin ger-cireuit, thus stopping the ringing of the bell. is raised or restored to its position under the catch-bar a projection, 0 on said contact-strip 0, striking against the drop, causes the contactstrip to swing back into its original position under the contact-strip 0 so that when the drop again falls the connection between t and 0 will be made the same as before.

The numbers on the drop-plate B indicate the number of the telephone-station from which the signal comes.

' By use of my invention the first impulse giving the signal at once automatically shunts the annunciatorcoils and sets in operation the continuously-ringing bell, which. rings until the operators attention is called and he turns the handle and when the drop is raised the short circuit, which shunts the annuneiator, is automatically broken, and the spring 0 which forms part of the ringer-circuit, is automati cally pushed back in place to form a connection with c the next time the drop falls.

It should be observed that the spring coir tact-strips c and 0 should be so adjusted and arranged that the weight of the drop will force them against the strips 0 and 0 respectively, to form the connections, while when the drop is raised they spring back to break the conneetion.

If preferred, the strips 0 and 0 instead of operating as springs, may be secured loosely to the binding-posts, so as to operate by their When the drop gravity to break the connection when the drop is raised.

I claim- 7 1. In a telephone-annuneiator, the combination of frame A, drop B, hinged thereto and provided with arm a, pivoted armature D, provided with adjustable catch-bar I), contactstrips 0 0 forming part of a short circuit to shunt the coils of the annunciator, and contactstrips 0 0 forming part of the ringer-circuit, said contact-strips being operated by said arm a to make and break the circuits, substantially as specified.

2. The combination of drop B, provided with arm a contact-strip 0 being part of the ringer-circuit, provided with a handle, whereby the operator may break the circuit, and means whereby the said strip is restored to its normal position by raising the drop, said strip being' operated by said arm a to make the connection when the drop falls, substantially as specified.

JOHN B. ODELL.

Witnesses:

H. M. MUNDAY, TAYLOR EVERETT BROWN. 

